Cisco dual BGP with AS prepend (Load-Balancing)
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[Traffic flow]
[CPE/Customer Cisco Router]
Current configuration:
!
version 12.x
!
hostname CPE
!
interface Ethernet0
description to Internal network
ip address 10.1.0.1 255.255.255.0ip address 10.1.0.129 255.255.255.128 secondary
no ip directed-broadcast
no ip mroute-cache
!
interface Serial0
description to ISP A – WAN 1
ip address 12.1.3.1 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
interface Serial1
description to ISP A – WAN 2ip address 12.1.4.1 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
router bgp 10
no auto-summarynetwork 10.1.0.0 mask 255.255.255.0network 10.1.0.128 mask 255.255.255.128neighbor 12.1.3.2 remote-as 20
neighbor 12.1.3.2 version 4neighbor 12.1.3.2 prefix-list 1 out
neighbor 12.1.4.2 remote-as 20
neighbor 12.1.4.2 version 4
neighbor 12.1.4.2 route-map second_link out!
ip classless
!ip route 0.0.0.0 0.0.0.0 Serial0
ip route 0.0.0.0 0.0.0.0 Serial1!ip prefix-list 1 seq 5 permit 10.1.0.0/24
!
route-map second_link permit 10
set as-path prepend 10 10
!line con 0
line aux 0
line vty 0 4
login
!
end
[PE1 / ISP Cisco Router]
Current configuration:
!
version 12.x
!
hostname PE!
!
interface Serial0
description to WAN 1
ip address 12.1.3.2 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!router bgp 20
no auto-summary
neighbor 12.1.3.1 remote-as 10
neighbor 12.1.3.1 version 4
neighbor 12.1.3.1 distribute-list 2 out
!
ip classless
!access-list 2 deny any <– no route sent
!line con 0
line aux 0
line vty 0 4
login
!
end
!
version 12.x
!
hostname PE
!
interface Serial1
description to WAN 2
no ip mroute-cache
no ip directed-broadcast
no fair-queue
!
no auto-summary
neighbor 12.1.4.1 remote-as 10
neighbor 12.1.4.1 version 4
!
ip classless
!
line con 0
line aux 0
line vty 0 4
login
!
end
[Verifing output]
CPE# show ip bgp neighbors 12.1.3.2 ad
BGP table version is 3, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 0.0.0.0 0 32768 iTotal number of prefixes 1
CPE#
CPE# show ip bgp neighbors 12.1.4.2 ad
BGP table version is 3, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 0.0.0.0 0 32768 i
*> 10.1.0.128/25 0.0.0.0 0 32768 iTotal number of prefixes 2
CPE#CPE# show ip bgp neighbors 12.1.3.2 ro
Total number of prefixes 0
CPE#CPE# show ip bgp neighbors 12.1.4.2 ro
Total number of prefixes 0
CPE#PE1#show ip bgp nei 12.1.3.1 ro
BGP table version is 64, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 12.1.3.1 0 0 10 iTotal number of prefixes 1
PE1#PE2#show ip bgp nei 12.1.4.1 ro
BGP table version is 104, local router ID is 4.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 12.1.4.1 0 0 10 10 10 i
*> 10.1.0.128/25 12.1.4.1 0 0 10 10 10 iTotal number of prefixes 2
PE2#Internet#traceroute 10.1.0.1
Type escape sequence to abort.
Tracing the route to 10.1.0.11 PE1 (20.3.5.1) 20 msec 24 msec 28 msec
2 CPE (12.1.3.1) 48 msec * 64 msec
Internet#traceroute 10.1.0.129
Type escape sequence to abort.
Tracing the route to 10.1.0.1291 PE2 (20.4.5.1) 20 msec 28 msec 32 msec
2 CPE (12.1.4.1) 40 msec * 52 msec
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